Arc-lamp.



PATENTED AUG. 18, 1908.

r S 1 m/,W T. a n E I m w m s .l. rt A S T E E H s 3 0 9 l E -N T w M DAB GLH SG R R T A U I L P A I L C Witnesses PATENTED AUG. 18, 1908.

R. SCOTT.

ARG LAMP.

APPLICATION FILED JUNE 1,1905.

3 SHEETS-SHEET 2.

if Inventor,

Witness Attorneys N0.-896,417. PATENTED AUG. 18, 1908. R. SCOTT.

ARC LAMP.

APPLICATION FILED JUNE 1,1905.

3 SHEETS-SHEET 3 Fig. 7.

. UNTTED STATES PATENT OFFTCFQO RALPH SCOTT, OF WILKES-BAKER), PENNSYLVANIA, ASSIGNOR TO SCOTT ELECTRICAL COMPANY, A CORPORATION OF MAINE.

ARC-LAMP.

Specification of Letters Patent:

' Patented Aug. 18, 1908.

Application filed June 1, 1905. Serial No. 263,248.

I To all'tvhom it ma y'concern:

Be it known that I, R LPH SCOTT, a citizen of the United States, residing at Wilkes- Barre, in the county of Luzerne and State of Pennsylvania, have invented a new. and use ful Arc-liamp, of which the following is a as a meansfor operating the carbon clutch,

the resistance'being in the form of a coil which takes the place of the ordinary series or shunt actuating solenoid.

A still further object of the invention is to provide a novel form of carbon clutch actuating mechanism in which the coil is provided with a stationary core, and the carbon clutch is carried by a r ng armature of sott iron arranged adjacent. to one end of the companying drawings,

core and movable thereby as the resistance of the arc increases or diminishes. I

A still further object of the invention is to simplify the construction of the lamp proper and to provide an improved guiding and supporting means for the upper carbon.

With these and other objects in view, as will more fully hereinafter appear, the invention consists in certain novel features of construction and arrangement of parts, hereinafter fully described, illustrated in the acand particularly pointed out in the appended claims, it being understood that various changes in the form, proportions, size and minor details of thestruo'ture maybe made without de 'art ing from the spirit or sacrificing any 0 the view of the carbon clutch.

advantages of the invention.

1n the accompanying drawings :Figure 1 is a sectional elevation of the lamp. Fi 2 is a transverse sectional elevation of the lamp on the line 33 of Fig. 2. Fig. 3 is a detail view, partly in section, showing the combined steadying resistance and actuating solenoid, together with its armature and the dash pot for retarding movement of the armature. Fig. i is a sectional view on the line 55 of Fig; 4 looking in the direction in dicated by the arrows. Fig. 5 is a detail Fig 6 is an'enlarged sectional view. of a portion of the combined steadying resistance and actuating solenoid. Fig. 7 is a detail sectional view of .a wire 32.

the upper portion of the cap detached. Fig. 8 is a plan view of the cap. Fig. 9 is a sectional view of the lower porcelain disk, detached. Fig. 10 is a detail sectional view of the securing slide for the upper carbon. Fig. 11 is a lan view of the same. Fig. 12 is a detail view of one of the frame rods, showing the manner in which an intermediate por tion of the rod is upset and threaded to avoid the necessity of threading the rod throughout its entire length. Fig. 13 is a view partly in section illustrating a modification of the combined steadying resistance and actuating solenoid.

Simdar'numerals of reference are employed to indicate corresponding parts throughout the several figures of the drawings. I

The frame of the lamp includes principally a pair of metallic rods 10 and 11, and upper and lower disks 12 and 13, the upper of the disks constituting a ca and being provided with a endent annu ar flange serving to center t e casing or housing 14, preferably formed of sheet metal and provided with numerous perforations to permit the free circulation of air in order to maintain a constant low temperature within the casing. a The rods 10 and 11, at the points where they pass through the disks 12 and 13, are upset or increased in diameter, and are provided with threads, as indicated at 15 in Fig. 13, for the reception ofclamping nuts. The ends of the rods are extended upward beyond the cap disk 12 to form binding posts 16 and 17, respectively, and at the center of the cap is a suspension hook 18 of ordinary construction. The rod 10 is extended down below the disk 12 and is provided with a clamping collar 20 for the support of the lower carbon 21, and saidcarbon, as well as a portion of the upper carbon 22, is inclosed by a single globe 23 supportedby the lower portion of the casing 14, or preferably by yieldable supports 24. i

The two rods 10 and 11 form guides for a vertically movable slide 28, preferably formed of porcelain, see Fig. 11, and having its opposite ends provided with notches 29 for the rece tion of the rods. The central portion of t e slide is rovided with an opening for the reception 0 the upper end of a metallic sleeve 30 that is confined in place by a screw 31 that also forms a binding post for The lower end of the sleeveiSOfiis notched or split and forms a clamp for the reception of the upper end of the upper carbon 22.

The upper disk or cap member 12 is provided w1t1 an opening 34 for the reception of the up er threaded end of a tubular core 35 secured t ierein by nuts or in any desired way on which the windings of the combined steadying resistance and actuating solenoid are carried. The wire employed may be of German silver, or any other metal, providing the same has the requisite cross section and s ecific resistance required to give the desired 0 nnic factor. v V

In constructing the coil, the tubular core 35 is first covered by a strip of mica 36, Fig. 6 after which a layer of wire 37 is wound around the same. These turns are wound bare and packed closely together by which the turns are, of course, short circuited. Alternate layers of mica and wire are wound to the desired depth. After the coil has been wound and its ends secured, it is placed in a furnace andbrought to a cherry red heat, this continuing until the entire surface of the wires has been covered with a film of oxid. The result is that the turns, formerly short circuited, are very well insulated from one another. One end of the coil is connected to the wire 32, and the opposite end is connected by a wire or bar 40 to a binding screw 41 on the rod 11, this latter connection serving to prevent turning of the coil. The threaded upper end of the core 35 passes through an opening formed in an iron bar 42, approximately U-shaped in form and extending down on opposite sides of the coil where its ends are outwardly flared and extended some distance below the bottom of said coil. The ends of the bar are connected by, a brass strip 44 having a centrally disposed guiding opening for the passage of a rod or stem 45.

Secured to the lower porcelain disk 13 is a standard 46 carrying at its upper end a piston 47 that may be formed of graphite or other suitable material. This piston fits within a dash pot in the form of an open bottom cylinder 47, the upper end of which is secured to the rod 45. The upper end of the rod is bifurcated, forming two arms 48 that serve as su ports for a soft iron armature 49 in the f drm of a ring, the internal diameter of which is slightly greater than the external diameter of the iron core member 35, and whena current is passing through the coil, the armature will be moved upward. The central portion or" the disk 13 is provided with an opening 50 for the passage of the up er carbon, and at the up er face of the disk t 1e opening is countersun forming a recess 51 forthe reception of a tapered ring 52, forming a carbon clutch, said ring being provided with a perforated car 53 through which extends a hook 54 carried by the cylinder 47.

The circuit of the lamp may be traced from binding post 17, rod 11, binding screw 41, wire 40, coil 37, wire 32, the upper carbon 22, lower carbon 21, carbon carrier 20, rod 10, and binding post 16.

In operation the passage of a current will energize the coil, and the flux will raise the armature 49, the movement being transmitted to the carbon clutch to strike the arc. Should the current vary, or the length of the are be unduly increased, the armature will be lowered, and when the resistance of the arc decreases the armature will be raised.

()ne of the principal advantages of the structure resides in the employment of a steadying resistance as' a means for actuating the carbon clutch, the usual shunt or series wound coils being dispensed with, and the coil substituted therefor being of such nature that it may be heated to a Very high degree by the passage of a current without danger of injury.

In Fig. 13 is illustrated a slightly modified form of solenoid in which the armature is in the form of a movable core member 49' having an enlarged head 49".

' Having thus described the invention, what is claimed is In an arc lamp, a pair of vertical rods or guides, a carbon fixed to one of said guides, a second carbon arranged to have a vertical movement on said guides, a clutch surrounding the movable carbon, a magnet supported by said guides and having a central depend ing pole and a pair of additional salient poles adjacent thereto and diverging therefrom, an armature having a hole surrounding said central ole and moving toward the narrow por tion etween said poles, and connections between said armature and said clutch.

In testimony that I claim the foregoing as my own, I have hereto affixed my signature in the presence of two-witnesses.

RALPH SCOTT.

VVi tnessos J. F. UNEILL, D. L. ONEILL. 

